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Merged
jappeace merged 1 commit into from
Jun 6, 2026
Merged

Filter source with lib.fileset #33

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23 changes: 20 additions & 3 deletions nix/hpkgs.nix
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Original file line number Diff line number Diff line change
@@ -1,13 +1,30 @@
{ pkgs ? import ./pkgs.nix { }
,
}:
let
# Decision: use lib.fileset.toSource for fine grained source filtering.
# Alternatives considered: passing ../. directly (rebuilds on any nix/tooling
# change), cleanSource (still includes too much). fileset.unions makes the
# build inputs explicit so editing nix/, .github/, makefile, .hlint.yaml,
# etc. does not invalidate the haskell build cache.
src = pkgs.lib.fileset.toSource {
root = ../.;
fileset = pkgs.lib.fileset.unions [
../app
../src
../test
../template.cabal
../LICENSE
../Readme.md
../Changelog.md
];
};
in
# you can pin a specific ghc version with
# pkgs.haskell.packages.ghc984 for example.
# this allows you to create multiple compiler targets via nix.
pkgs.haskellPackages.override {
overrides = hnew: hold: {
# NB this is a bit silly because nix files are now considered for the build
# bigger projects should consider putting haskell stuff in a subfolder
template-project = hnew.callCabal2nix "template-project" ../. { };
template-project = hnew.callCabal2nix "template-project" src { };
};
}
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